🔧 FIX: Resolve 205→0 test compilation errors in trading_engine
Fixed all test compilation errors through Wave 8 parallel agent deployment,
achieving successful compilation of trading_engine library and tests.
## Wave 8: Test Fixes (6 Parallel Agents)
**Agent 1 - trading_tests.rs** (136 errors → 0)
- Fixed Price/Quantity API usage: new() returns Result, use .unwrap()
- Changed .value() to .to_f64() method
- Used Price::zero() and Quantity::zero() for zero values
- Fixed arithmetic operations to handle Result types
- Updated property tests with proper error handling
- Fixed memory layout tests for u64 internal representation
**Agent 2 - events.rs** (49 errors → 0)
- Added type TradingEvent = Event alias for backward compatibility
- Exposed test_utils module with #[cfg(test)] pub mod
- Added common::Symbol import to test_utils.rs
- Fixed orphaned test functions in proper mod tests block
- Enhanced test imports to include test_symbols module
**Agent 3 - audit_trails.rs** (0 errors)
- Already compiling successfully with proper imports
- No changes needed
**Agent 4 - transaction_reporting.rs** (0 errors)
- Already compiling successfully
- No changes needed
**Agent 5 - broker_client.rs** (20 errors → 0)
- Added rust_decimal::Decimal import (not re-exported from common)
- Added common::TimeInForce import
- Fixed TradingOrder struct initialization:
* Added metadata: HashMap::new()
* Added submitted_at, executed_at: None
* Added status: OrderStatus::Created
* Added fill_quantity: Decimal::ZERO
* Added average_fill_price: None
* Removed obsolete strategy_id field
**Agent 6 - data_interface.rs** (0 errors)
- Already compiling successfully with correct imports
- No changes needed
## Summary
✅ trading_engine (lib + tests): COMPILES SUCCESSFULLY
✅ trading_service (bin): COMPILES SUCCESSFULLY
✅ All trading_engine test files: 0 ERRORS
Remaining work: Other packages (backtesting, ml, risk, tli) have test errors
## Files Modified
- trading_engine/src/tests/trading_tests.rs
- trading_engine/src/types/events.rs
- trading_engine/src/types/test_utils.rs
- trading_engine/src/types/mod.rs
- trading_engine/src/trading/broker_client.rs
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